A visa is a conditional authorization granted by the state to a foreigner, allowing them to enter, remain within, or leave that territory. Visas typically may include limits on the duration of the foreigner's stay, areas within the country they may enter, the dates they may enter, the number of permitted visits, or an individual's right to work in the country in question. A visa is subject to entry permission by an immigration official at the time of actual entry and can be revoked at any time. A visa most commonly takes the form of a sticker endorsed in the applicant's passport or other travel documents.
India has the 84th most powerful passport in the world as per the Henley Passport Index.
Revoking the OCI card
The OCI card of a person can be revoked if it was obtained fraudulently, receives a lengthy prison sentence within 5 years of gaining the card, or for international security reasons.
If you are an Indian then you can make your career in almost more than 15 countries by taking advantage of a free visa. You can earn money and if you want you can stay there for a long time.